Electrical and Audio
A thought occurred to me. As you may or may not know, there's an antenna mount for Wranglers that is mounted underneath the bumper, so that there are no visible holes in the metal.
(More information: http://www.firestik.com/Instl-Art/ss-jx3.htm
http://www.stu-offroad.com/cb/cb1/cb-2.htm )...